I need help understanding what this code does, line by line.  for file in id_list: com_df_list=[]subfolders = [f.path for f in os.scandir(source_dir) if f.is_dir() ] for dirr in subfolders:file_loc = dirr +"/"+ file.strip()+input_end# print(file_loc)df = pd.read_csv(file_loc) com_df_list.append(df)

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Stack operations

A stack is a linear data structure that follows certain order to perform the operation; the order will be LIFO (Last In First Out) data structure. In the stack data structure elements/items are removed and added only from the top. The topmost stack item/element is pointed by the top pointer and the element which is added to the stack first will get deleted at the last.